EP3171011A1 - Abgasrückführungssystem - Google Patents

Abgasrückführungssystem Download PDF

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Publication number
EP3171011A1
EP3171011A1 EP16199504.8A EP16199504A EP3171011A1 EP 3171011 A1 EP3171011 A1 EP 3171011A1 EP 16199504 A EP16199504 A EP 16199504A EP 3171011 A1 EP3171011 A1 EP 3171011A1
Authority
EP
European Patent Office
Prior art keywords
valve
egr
exhaust gas
throttle valve
intake duct
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP16199504.8A
Other languages
English (en)
French (fr)
Other versions
EP3171011B1 (de
Inventor
Sam Penzato
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ford Global Technologies LLC
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Ford Global Technologies LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ford Global Technologies LLC filed Critical Ford Global Technologies LLC
Publication of EP3171011A1 publication Critical patent/EP3171011A1/de
Application granted granted Critical
Publication of EP3171011B1 publication Critical patent/EP3171011B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/52—Systems for actuating EGR valves
    • F02M26/64—Systems for actuating EGR valves the EGR valve being operated together with an intake air throttle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/02—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning induction conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
    • F02D9/10—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps
    • F02D9/1035—Details of the valve housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
    • F02M26/06—Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream of the compressor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/09—Constructional details, e.g. structural combinations of EGR systems and supercharger systems; Arrangement of the EGR and supercharger systems with respect to the engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
    • F02M26/21—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system with EGR valves located at or near the connection to the intake system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/51—EGR valves combined with other devices, e.g. with intake valves or compressors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/65—Constructional details of EGR valves
    • F02M26/66—Lift valves, e.g. poppet valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/65—Constructional details of EGR valves
    • F02M26/70—Flap valves; Rotary valves; Sliding valves; Resilient valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/02—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning induction conduits
    • F02D2009/0201—Arrangements; Control features; Details thereof
    • F02D2009/0276—Throttle and EGR-valve operated together

Definitions

  • the present disclosure relates to an exhaust gas recirculation (EGR) apparatus, and in particular to a low-pressure EGR apparatus.
  • EGR exhaust gas recirculation
  • EGR exhaust gas recirculation
  • the EGR gases are introduced upstream of the turbocharger compressor inlet. The pressure at this location is low, even in high engine boost conditions, which allows for the low pressure recirculation of the exhaust gases.
  • EGR gases introduced upstream of the turbocharger compressor are mixed with engine inlet air before entering the turbocharger compressor inlet.
  • the amount of EGR gases which can be introduced may determine the extent to which engine efficiency and exhaust gas pollutant levels are improved.
  • the level of recirculation possible is often limited by condensation of water droplets in the exhaust gases.
  • water vapour begins to condense from the exhaust gases. This effect may be exacerbated in cold ambient conditions.
  • Contact between the EGR gases and the walls of the duct upstream of the turbocharger compressor also contributes to the condensation. Water droplets can be undesirable at the inlet of the compressor, especially when large water droplets are formed, which may damage the compressor blades.
  • the EGR gases it is desirable for the EGR gases to be introduced close to the compressor face.
  • unstable turbulent air can reduce the compressor's operational efficiency.
  • an exhaust gas recirculation (EGR) apparatus for a turbocharged internal combustion engine, the EGR apparatus comprising: an air intake duct with a throttle valve configured to control an intake air quantity flowing through the air intake duct to a turbocharger compressor; an exhaust gas recirculation inlet connected to the air intake duct downstream of the throttle valve; and an EGR valve configured to control an exhaust gas quantity recirculated to the turbocharger compressor via the exhaust gas recirculation inlet, wherein the throttle valve and the EGR valve are combined in a single valve unit in which the valves are separated by a separating element configured to substantially prevent exhaust gas from entering the air intake duct in a vicinity of the throttle valve.
  • EGR exhaust gas recirculation
  • valves in a single valve unit in which the valves can operated simultaneously, so that the air intake duct can be closed and at the same time the exhaust gas recirculation inlet can be opened (or the air intake duct opened and the exhaust gas recirculation inlet closed), for example by means of a common actuator, can realize savings in weight, complexity and cost compared to separate throttle valve and EGR valve units having dedicated actuators for example.
  • the valve unit can have a main valve body defining a passage through which exhaust gas flows to the exhaust gas recirculation inlet when a movable valve element of the EGR valve is in an open position, and the separating element can be disposed between the passage of the valve body and the throttle valve.
  • This provides a simple configuration for fluidly separating the air flow in the vicinity of the throttle valve from the recirculated exhaust gas.
  • the main valve body can be directly attached to the air intake duct.
  • the movable valve element of the EGR valve can be mechanically connected to a movable valve element of the throttle valve by a valve stem which passes through a gap in the separating element.
  • the throttle valve can be mechanically connected to the EGR valve by any kind of linkage, gears, or other mechanism configured to allow the valves to operate in unison.
  • the exhaust gas recirculation inlet can comprise a conduit which fluidly connects the passage of the valve body to the interior of the air intake duct downstream of the throttle valve.
  • This provides a simple construction by which the exhaust gas can be introduced to the air intake duct downstream of the throttle valve.
  • the distance between the throttle valve and the point of introduction of the exhaust gas into the air intake duct, the distance between the throttle valve and the turbocharger compressor, and/or the distance between the point of introduction of the exhaust gas into the air intake duct and the turbocharger can be varied depending on engine application and EGR usage schedules. Furthermore, installation factors and limitations such as duct size and shape can affect the positioning.
  • the conduit can have an opening on the air intake duct. Alternatively, the conduit may extend into the air intake duct.
  • the conduit can include an end portion that extends upwardly into the air intake duct.
  • the end portion can be curved so as to direct exhaust gas towards the turbocharger compressor.
  • the end portion may comprise an initial straight portion extending into the air intake duct, followed by a bend section that curves towards the turbocharger compressor, followed by a further straight section.
  • the outlet of the end portion can be positioned centrally with respect to the air intake duct outlet.
  • the separating element can comprises a plate, which can be can formed as an integral cast part of the EGR apparatus or, alternatively, as a component which is inserted between the passage and the throttle valve, for example during assembly of the EGR apparatus.
  • the throttle valve can comprise a throttle flap.
  • the EGR valve can comprise a lifting valve such as a poppet valve.
  • an engine system comprising: an internal combustion engine having an intake manifold and an exhaust manifold; a turbocharger mounted on the engine, the turbocharger including a turbine fluidly connected to the exhaust manifold and a compressor fluidly connected to the intake manifold; and the aforementioned exhaust gas recirculation (EGR) apparatus.
  • a motor vehicle including the aforementioned engine system.
  • an exhaust gas recirculation (EGR) method for an internal combustion engine with a turbocharger comprising: controlling, by the throttle valve, an intake air quantity flowing through an air intake duct provided with the throttle valve to a compressor of the turbocharger; and controlling, by the EGR valve which is combined with the throttle valve as a single valve unit, an exhaust gas quantity recirculated to the compressor via an exhaust gas recirculation inlet connected to the air intake duct downstream of the throttle valve; and substantially preventing, by a barrier which separates the throttle valve from the EGR valve, exhaust gas from entering the air intake duct at the throttle valve.
  • EGR exhaust gas recirculation
  • low-pressure exhaust gas recirculation (EGR) systems In low-pressure EGR systems, exhaust gas generated by an engine exits through an exhaust manifold and passes through a turbocharger turbine which powers a turbocharger compressor. The exhaust gas then flows either into an exhaust pipe, from which the exhaust gas leaves the vehicle, or into an EGR loop. In the low-pressure EGR loop, the exhaust gas passes through a low pressure EGR cooler, which cools the temperature of the exhaust gas, subsequent to which it passes through an EGR valve and then is mixed with air in an air intake duct. The mixture of air and exhaust gas is then introduced to the turbocharger compressor which pressurizes the mixed intake gas. The highpressure mixture is then passed through a charge air cooler into an intake manifold of the engine.
  • EGR exhaust gas recirculation
  • FIG. 1 is a schematic diagram of an EGR apparatus 10 which can be implemented as part of a low pressure EGR system.
  • the EGR apparatus 10 comprises a throttle valve 14 and an EGR valve 16 that are combined together as a single valve unit, referred to herein as a “combination valve” (or “combi-valve” for short), in which the amount of intake air supplied to the turbocharger compressor and the amount of exhaust gas recirculated to the turbocharger compressor is simultaneously controlled.
  • the throttle valve 14 is arranged between an inlet 18 and an outlet 20 of an air intake duct 12, and controls the amount of intake air supplied to the turbocharger by opening or closing the air intake duct 12.
  • the air intake duct 12 directs intake air toward the turbocharger compressor (not depicted in Figure 1 ), and can be of circular or some other cross section.
  • the throttle valve 14 can be any suitable valve for controlling the flow of intake air through the air intake duct 12, though in this example the throttle valve 14 comprises a throttle flap (throttle plate) 26 mounted on a hinge 28.
  • the hinge 28 serves as an actuator which changes the position of the throttle flap 26 between open and closed positions.
  • any type of controlling mechanism such as a solenoid, pneumatic, hydraulic actuator or other type of mechanism can be provided.
  • the EGR valve 16 is arranged in an EGR path, and controls the amount of exhaust gas recirculated to the turbocharger by opening or closing the EGR path.
  • the EGR valve allows a flow of exhaust gas to the air intake duct 12 when in an open position, and blocks the flow of exhaust gas to the air intake duct 12 when in a closed position.
  • the EGR valve 16 comprises a valve head 38 and a valve seat 40, which is an aperture positioned in a path of exhaust gas flow between an inlet port 34 and an outlet port 36 of a main body 32 of the combination valve.
  • the valve head 38 is movable between the closed position where the valve head 38 is seated on (brought into contact with), and seals, the valve seat 40, and the open position where the valve head 38 is lifted away from the valve seat 40.
  • the EGR valve 16 is a lifting valve such as a poppet valve.
  • the EGR valve 16 can be any suitable valve for controlling the flow of exhaust gas.
  • the valve head 38 of the EGR valve 16 is connected to the throttle flap 26 by a valve stem 42.
  • the combination valve can simultaneously control the flow of intake air through the air intake duct 12 and the flow of exhaust gas recirculated to the air intake duct 12, that is simultaneously close the air intake duct 12 and open the exhaust gas path (or open the air intake duct 12 and close the exhaust gas path), by means of a single actuator, i.e., via the hinge 28.
  • the EGR apparatus 10 shown in Figure 1 has the disadvantage that the exhaust gas entry location is the same as the throttle valve location.
  • the throttle it is desirable for the EGR gases to be introduced close to the compressor face, but on the other hand it is also desirable for the throttle to be placed at a distance from the compressor face.
  • the throttle flap causes major disturbances to the oncoming clean air (shown in Figure 2 as wavy lines and large arrow, respectively).
  • This unstable, turbulent air directly in front of the compressor i.e., the compressor wheel
  • a uniform and stable flow is desired for optimum compressor performance.
  • FIGS 4 and 5 are schematic diagrams of an EGR apparatus in which the exhaust gas entry point to the air intake duct is separated from the main body of the combination valve. Similar to the EGR apparatus 10 depicted in Figure 1 , the EGR apparatus 10 depicted in Figures 4 and 5 comprises a throttle valve 14 and an EGR valve 16. As before, the throttle valve 14 comprises a pivotable element 26 (throttle flap) attached to a hinge 28, and the EGR valve 16 comprises a valve head 38 and a valve seat 40 formed such that an exhaust gas flow path (indicated by the dashed line) is created for exhaust gas to flow through when the valve head 38 is in an open position.
  • the throttle valve 14 comprises a pivotable element 26 (throttle flap) attached to a hinge 28
  • the EGR valve 16 comprises a valve head 38 and a valve seat 40 formed such that an exhaust gas flow path (indicated by the dashed line) is created for exhaust gas to flow through when the valve head 38 is in an open position.
  • the outlet port 36 of the valve body 32 is fluidly connected to an exhaust gas recirculation inlet 48 that is connected to the air intake duct 12 downstream of the throttle valve 14.
  • the exhaust gas recirculation inlet 48 comprises a conduit extending from the outlet port 36 of the valve body 32 to an opening 52 into the air intake duct 12.
  • the exhaust gas recirculation inlet may have any size, shape or configuration suitable for directing exhaust gas to the air intake duct 12.
  • the EGR valve 14 is separated from the throttle valve 14 by a plate 56 which is configured to substantially prevent exhaust gas from entering the interior of the air intake duct in a vicinity of the throttle valve 14.
  • the hinge 28 is spaced apart from the passage 54 in the valve body 32 through which recirculated exhaust gas flows, i.e., the hinge shaft has an axis of rotation that is spaced apart from the passage 54.
  • the hinge shaft has an axis of rotation that is spaced apart from the passage 54.
  • the plate 56 includes a slot 58 through which the valve stem 42 extends.
  • the EGR apparatus depicted in Figures 4 and 5 retains the combined nature of the throttle and EGR valves in a simple structure, while providing a separate path for the recirculated exhaust gas.
  • separating the hinge 28 from the passage 54 through which recirculated exhaust gas flows is advantageous in that it can avoid the need for seals that may otherwise be required for rotating components in the recirculated exhaust gas flow.
  • EGR apparatus 10 Air intake duct 12 Throttle valve 14 EG R valve 16 Air intake duct inlet 18 Air intake duct outlet 20 Throttle flap 26 Hinge 28 Main body 32 Inlet port 34 Outlet port 36 Valve head 38 Valve seat 40 Valve stem 42 Compressor 44 Turbocharger 46 Exhaust gas recirculation inlet 48 Opening 52 Passage 54 Plate 56 Slot 58

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Supercharger (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
EP16199504.8A 2015-11-19 2016-11-18 Abgasrückführungssystem Active EP3171011B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1520387.0A GB2544731B (en) 2015-11-19 2015-11-19 An exhaust gas recirculation apparatus

Publications (2)

Publication Number Publication Date
EP3171011A1 true EP3171011A1 (de) 2017-05-24
EP3171011B1 EP3171011B1 (de) 2018-09-26

Family

ID=55133013

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16199504.8A Active EP3171011B1 (de) 2015-11-19 2016-11-18 Abgasrückführungssystem

Country Status (6)

Country Link
US (1) US10337470B2 (de)
EP (1) EP3171011B1 (de)
CN (1) CN106762239B (de)
GB (1) GB2544731B (de)
MX (1) MX2016015194A (de)
RU (1) RU2016144207A (de)

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RU2016144207A3 (de) 2020-02-06
US20170145967A1 (en) 2017-05-25
CN106762239B (zh) 2020-08-28
GB2544731B (en) 2019-02-20
US10337470B2 (en) 2019-07-02
EP3171011B1 (de) 2018-09-26
RU2016144207A (ru) 2018-05-10
GB2544731A (en) 2017-05-31
GB201520387D0 (en) 2016-01-06
CN106762239A (zh) 2017-05-31
MX2016015194A (es) 2018-05-17

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